JPWO2022049889A5 - - Google Patents

Description

The present disclosure relates to motors.

2. Description of the Related Art Conventionally, a motor provided with a pair of terminals for power supply is known (see Patent Document 1, for example).

In general, it is desirable that the motor has a relatively small number of terminals. Therefore, in a motor capable of dynamically switching between a plurality of operation modes with different rotation states, there is a demand to reduce the number of terminals for dynamically switching between operation modes.

WO2020/008924

Accordingly, the present disclosure is a motor capable of dynamically switching between three operation modes with different rotation states. SUMMARY OF THE DISCLOSURE An object of the present disclosure is to provide a motor with one terminal in addition to a pair of terminals for power supply.

A motor according to an aspect of the present disclosure includes a first terminal and a second terminal to which a single-phase alternating current is input, a third terminal, and a motor connected to the first terminal and the second terminal, an AC/DC converter that converts the single-phase alternating current into a direct current; an inverter that converts the direct current into a three-phase alternating current by pulse width modulation control (PWM control) using a pulse width modulation signal (PWM signal); A winding to which a three-phase alternating current is supplied, a rotor that rotates due to the magnetic field generated in the winding, a control unit that outputs the PWM signal to the inverter, a detection circuit connected to the third terminal, wherein the detection circuit is configured such that, in a state in which the single-phase alternating current is input to the first terminal and the second terminal, (1) the third terminal is short-circuited with the first terminal; (2) outputting a second detection signal when the third terminal is short-circuited with the second terminal; (3) outputting a second detection signal when the third terminal is short-circuited; is in an open state, the control unit outputs a third detection signal when the detection circuit outputs the first detection signal, the rotor is in a first rotation state, and the The rotor is in the second rotation state when the detection circuit outputs the second detection signal, and the rotor is in the third rotation state when the detection circuit outputs the third detection signal. The PWM signal is output so that the rotating state of .

The above configuration provides a motor capable of dynamically switching between three operation modes with different rotation states, the motor having one terminal in addition to a pair of terminals for power supply.

FIG. 1 is a block diagram showing a configuration example of a motor drive system according to Embodiment 1. FIG. FIG. 2A is a waveform diagram of single-phase alternating current supplied from a single-phase alternating current power supply. FIG. 2B is a waveform diagram of the detection signal line. FIG. 3A is a waveform diagram of single-phase alternating current supplied from a single-phase alternating current power supply. FIG. 3B is a waveform diagram of the detection signal line when the third terminal is short-circuited to the second terminal. FIG. 4A is a waveform diagram of single-phase alternating current supplied from a single-phase alternating current power supply. FIG. 4B is a waveform diagram of the detection signal line when the third terminal is open. FIG. 5 is a block diagram showing a configuration example of a motor drive system according to Embodiment 2. As shown in FIG. FIG. 6A is a waveform diagram of single-phase alternating current supplied from a single-phase alternating current power supply. FIG. 6B is a waveform diagram of the detection signal line. FIG. 7A is a waveform diagram of single-phase alternating current supplied from a single-phase alternating current power supply. FIG. 7B is a waveform diagram of the detection signal line when the third terminal is short-circuited to the second terminal. FIG. 8 is a block diagram showing a configuration example of a motor drive system according to Embodiment 3. As shown in FIG. FIG. 9A is a waveform diagram of single-phase alternating current supplied from a single-phase alternating current power supply. FIG. 9B is a waveform diagram of the detection signal line when the third terminal 13 is open. FIG. 10A is a waveform diagram of single-phase alternating current supplied from a single-phase alternating current power supply. FIG. 10B is a waveform diagram of the detection signal line when the third terminal is short-circuited to the first terminal. FIG. 11A is a waveform diagram of single-phase alternating current supplied from a single-phase alternating current power supply. FIG. 11B is a waveform diagram of the detection signal line.

(Circumstances leading to obtaining one aspect of the present disclosure)
Conventionally, motors have been used in cooling devices for cold chain applications (for example, freezer showcases, etc.) that handle products in a cooled state.

In the cooling device, it is necessary to dynamically switch the operation mode of the motor in order to switch the strength of the airflow, switch to the defrosting operation, and the like. For example, the operation of switching between strong and weak airflow is realized by dynamically switching between operation modes with different rotation speeds of the motor. Also, for example, the switching operation to the defrosting operation is realized by dynamically switching operation modes in which the rotation directions of the motor are different from each other.

On the other hand, motors used in cooling devices are desired to have a relatively small number of terminals.

Therefore, the inventors diligently conducted experiments and studies on a configuration capable of suppressing the number of terminals other than the pair of terminals for power supply in a motor capable of dynamically switching between different operation modes. rice field. As a result, the following motor was conceived.

A motor according to an aspect of the present disclosure includes a first terminal and a second terminal to which a single-phase alternating current is input, a third terminal, and a motor connected to the first terminal and the second terminal, An AC (Alternating Current) / DC (Direct Current) converter that converts the single-phase alternating current to a direct current, and an inverter that converts the direct current to a three-phase alternating current by being PWM-controlled by a PWM (Pulse Width Modulation) signal; a winding to which the three-phase alternating current is supplied, a rotor that rotates due to the magnetic field generated in the winding, a control unit that outputs the PWM signal to the inverter, and a detection circuit that is connected to the third terminal. wherein the detection circuit is configured such that, in a state where the single-phase alternating current is input to the first terminal and the second terminal, (1) the third terminal is short-circuited with the first terminal; (2) outputting a second detection signal when the third terminal and the second terminal are short-circuited; (3) outputting a second detection signal when the third terminal is short-circuited; a third detection signal is output when the terminal is in an open state, the control unit causes the rotor to be in a first rotation state when the detection circuit is outputting the first detection signal, and The rotor is in the second rotation state when the detection circuit outputs the second detection signal, and the rotor is in the second rotation state when the detection circuit outputs the third detection signal. The PWM signal is output so that the rotation state of 3 is obtained.

According to the motor having the above configuration, (1) the third terminal is short-circuited with the first terminal so that the rotor is in the first rotation state; (3) By opening the third terminal, the rotor enters the third rotating state. As described above, according to the motor configured as described above, the motor is capable of dynamically switching between three operation modes with different rotation states, and the pair of terminals for power supply (that is, the first terminal and the second 2 terminals) and one terminal (ie, a third terminal) is provided.

The first rotation state, the second rotation state, and the third rotation state include at least a rotation state in which the rotor rotates in a first rotation direction, and a rotation state in which the rotor rotates in a first rotation direction. A rotational state of rotating in a second direction of rotation opposite to the first direction of rotation may also be included.

As a result, the motor configured as described above can operate in an operation mode in which the rotation directions of the rotors are opposite to each other.

Further, a storage unit that stores PWM information that defines the waveform of the PWM signal, an update unit that updates the PWM information, and an operation reception unit that receives an operation of the motor from a user, wherein the control unit , the PWM signal may be output based on the PWM information, and the updating unit may update the PWM information based on the operation received by the operation receiving unit from the user.

As a result, the motor configured as described above can operate in the operation mode set by the user.

A specific example of the motor according to one aspect of the present disclosure will be described below with reference to the drawings. All of the embodiments shown here show one specific example of the present disclosure. Therefore, the numerical values, shapes, components, arrangement and connection of components, steps (processes), order of steps, etc. shown in the following embodiments are examples and are not intended to limit the present disclosure. . Each figure is a schematic diagram and is not necessarily strictly illustrated.

It should be noted that general or specific aspects of the present disclosure may be implemented in a system, method, integrated circuit, computer program, or recording medium such as a computer-readable CD-ROM (Compact Disk Read Only Memory). , methods, integrated circuits, computer programs and recording media.

(Embodiment 1)
<Configuration>
FIG. 1 is a block diagram showing a configuration example of a motor drive system 1 according to Embodiment 1. As shown in FIG.

As shown in FIG. 1 , the motor drive system 1 includes a motor 10 and a single-phase AC power supply 20 .

A single-phase alternating current power supply 20 supplies single-phase alternating current to the motor 10 . The single-phase alternating current supplied by the single-phase alternating current power supply 20 is, for example, single-phase alternating current with an effective voltage of 100 V and a frequency of 60 Hz. Single-phase AC power supply 20 may be, for example, a commercial power supply.

The motor 10 is driven by a single-phase alternating current supplied from a single-phase alternating current power supply 20 as a power source. Motor 10 may be, for example, an induction motor.

As shown in FIG. 1, the motor 10 includes a first terminal 11, a second terminal 12, a third terminal 13, an AC/DC converter 30, an inverter 40, windings 50, a rotor 60 , a control unit 70 , a storage unit 71 , an update unit 72 , an operation reception unit 73 , and a detection circuit 80 .

The first terminal 11 and the second terminal 12 are terminals for inputting single-phase alternating current supplied from the single-phase alternating current power supply 20 and are connected to the AC/DC converter 30 .

The third terminal 13 is (1) shorted with the first terminal 11, (2) shorted with the second terminal 12, or (3) open. , is connected to the detection circuit 80 . The third terminal 13 may be in states other than these states. These states may be selectively achieved by a relay (not shown) connected to the third terminal 13 outside the motor 10, for example.

Each of the first terminal 11, the second terminal 12, and the third terminal 13 is realized by a conductive material. Each of the first terminal 11, the second terminal 12, and the third terminal 13 may be realized by a metal connector or may be realized by a lead wire, for example.

AC/DC converter 30 converts single-phase alternating current supplied from single-phase alternating current power supply 20 into direct current. More specifically, the AC/DC converter 30 includes one or more diodes (here, four diodes) and one or more capacitors (here, one capacitor). is rectified, and the rectified pulsating current is smoothed by one or more capacitors to convert single-phase alternating current to direct current.

The inverter 40 is PWM-controlled by a PWM (Pulse Width Modulation) signal to convert the direct current converted by the AC/DC converter 30 into a three-phase alternating current. More specifically, inverter 40 includes a plurality of switching elements (here, six switching elements) that perform switching operations, and these switching elements are controlled by a PWM signal output from control unit 70, which will be described later. By being PWM-controlled, the direct current converted by the AC/DC converter 30 is converted into three-phase alternating current consisting of U-phase, V-phase, and W-phase.

The winding 50 is supplied with the three-phase alternating current converted by the inverter 40 and generates a magnetic field that rotates the rotor 60 . More specifically, winding 50 includes a U-phase-connected coil, a V-phase-connected coil, and a W-phase-connected coil that are Y-connected to each other. A magnetic field that rotates the rotor 60 is generated by changing the current flowing through these three coils. The windings 50 may be, for example, delta-connected.

The rotor 60 rotates due to the magnetic field generated in the windings 50 . The rotor 60 is rotatable about the rotation axis in either a first rotation direction or a second rotation direction opposite to the first rotation direction. The rotor 60 changes its rotational speed and rotational direction according to the magnetic field generated in the windings 50 . That is, the rotor 60 changes its rotational speed and rotational direction according to the three-phase alternating current converted by the inverter 40 .

When the first terminal 11 and the second terminal 12 are supplied with a single-phase alternating current, the detection circuit 80 detects (1) the third terminal 13 and the first terminal 11 short-circuited. (2) output a second detection signal when the third terminal 13 is short-circuited with the second terminal 12; and (3) output a second detection signal when the third terminal 13 is open. A third detection signal is output if there is.

A specific circuit configuration example of the detection circuit 80 will be described below with reference to the drawings.

As shown in FIG. 1, the detection circuit 80 includes a diode 81, a diode 82, an NPN transistor 83 (hereinafter also simply referred to as transistor 83), an NPN transistor 84 (hereinafter also simply referred to as transistor 84), It comprises a resistor element 85 , a resistor element 86 , a resistor element 87 , a resistor element 88 , a resistor element 89 , a resistor element 90 , a control power source 91 , a detection signal line 101 and a detection signal line 102 .

The diode 81 has an anode connected to the first terminal 11 and rectifies the single-phase AC input from the single-phase AC power supply 20 to the first terminal 11 .

Resistive elements 85 and 87 are connected in series between the cathode of diode 81 and ground to divide the potential of the cathode of diode 81 .

A control power supply 91 supplies a potential for pulling up the detection signal line 101 and the detection signal line 102 . Here, as an example, the potential is 5V. The control power supply 91 may include, for example, a DC/DC converter (not shown), and the DC/DC converter may supply a potential by converting the DC potential converted by the AC/DC converter 30 .

The resistive element 89 is connected to the control power supply 91 and the detection signal line 101, and pulls up the detection signal line 101 to the control potential.

The transistor 83 has an open collector output, the base and emitter are connected to one terminal and the other terminal of the resistance element 87 respectively, and the collector is connected to the detection signal line 101 . The transistor 83 outputs a detection signal when the potential difference between one terminal and the other terminal of the resistance element 87, ie, the divided voltage potential of the anode potential of the diode 81, is larger than a threshold (for example, 0.6 V). A conducting state is established between the line 101 and the ground, and a non-conducting state is established between the detection signal line 101 and the ground when it is smaller than the threshold value.

Here, the resistance value of the transistor 83 in the ON state is sufficiently smaller than the resistance value of the resistance element 89 . Therefore, when the transistor 83 is on, the potential of the detection signal line 101 is substantially the ground potential (that is, substantially 0V). Therefore, the potential of the detection signal line 101 is the potential pulled up by the resistance element 89 when the transistor 83 is off, and substantially the ground potential when the transistor 83 is on.

Therefore, the potential of the detection signal line 101 becomes high level (ie, control potential) when the divided voltage potential of the pulsating current rectified by the diode 81 is smaller than the threshold, and becomes low level (ie, control potential) when it is larger than the threshold. , substantially ground potential).

FIG. 2A is a waveform diagram of the single-phase alternating current supplied from the single-phase alternating current power supply 20. FIG. 2B is a waveform diagram of the detection signal line 101. FIG.

As shown in FIG. 2B, the potential of the detection signal line 101 becomes a pulse signal that alternately repeats a high level and a low level in the same period as the single-phase alternating current.

Diode 82 is a device similar to diode 81 . The diode 82 has an anode connected to the third terminal 13, and (1) when the third terminal 13 is short-circuited to the first terminal 11, the single-phase AC power supply 20 to the first terminal 11, and (2) input from the single-phase AC power supply 20 to the second terminal 12 when the third terminal 13 is short-circuited to the second terminal 12. rectifies single-phase alternating current.

Resistive element 86 and resistive element 88 are elements similar to resistive element 85 and resistive element 87, respectively. Resistive elements 86 and 88 are connected in series to the cathode of diode 81 and divide the potential of the cathode of diode 81 .

Resistance element 90 is an element similar to resistance element 89 . The resistance element 90 is connected to the control power supply 91 and the detection signal line 102, and pulls up the detection signal line 102 to the control potential.

Transistor 84 is a device similar to transistor 83 . The transistor 84 has an open collector output, the base and emitter are connected to one terminal of the resistance element 88 and the other terminal of the resistance element 88, respectively, and the collector is connected to the detection signal line 102. . When the potential difference between one terminal of the resistive element 88 and the other terminal of the resistive element 88, that is, the divided potential of the potential of the anode of the diode 82, is greater than a threshold (for example, 0.6 V), the transistor 84 First, the detection signal line 102 and the ground are brought into a conducting state, and when the threshold is smaller than the threshold, the detection signal line 102 and the ground are brought into a non-conducting state.

Here, the resistance value of the transistor 84 in the ON state is sufficiently smaller than the resistance value of the resistance element 90 . Therefore, when the transistor 84 is on, the potential of the detection signal line 102 is substantially the ground potential (that is, substantially 0V). Therefore, the potential of the detection signal line 102 is the control potential when the transistor 84 is off, and substantially the ground potential when the transistor 84 is on.

Therefore, the potential of the detection signal line 102 becomes high level (that is, control potential) when the divided voltage potential of the pulsating current rectified by the diode 82 is smaller than the threshold, and becomes low level (that is, control potential) when it is larger than the threshold. ground potential).

When the third terminal 13 is short-circuited to the first terminal 11, the potential of the detection signal line 102 is the same as the potential of the detection signal line 101 and has the same period as the single-phase alternating current. It becomes a pulse signal that alternately repeats a high level and a low level. This is because the third terminal 13 is short-circuited to the first terminal 11, so that the potential of the cathode of the diode 82 is the same as the potential of the cathode of the diode 81. FIG.

Therefore, the potential of the detection signal line 102 has the same waveform as the potential of the detection signal line 101 when the third terminal 13 is short-circuited to the first terminal 11 . Therefore, FIG. 2B is also a waveform diagram of the detection signal line 102 when the third terminal 13 is short-circuited to the first terminal 11 .

FIG. 3A is a waveform diagram of the single-phase alternating current supplied from the single-phase alternating current power supply 20. FIG. 3B is a waveform diagram of the detection signal line 102 when the third terminal 13 is short-circuited to the second terminal 12. FIG.

As shown in FIG. 3B, when the third terminal 13 is short-circuited to the second terminal 12, the potential of the detection signal line 102 is in the opposite phase to the potential of the detection signal line 101. becomes a pulse signal that alternately repeats a high level and a low level in the same cycle as . This is because the third terminal 13 is short-circuited to the second terminal 12 , so that the potential of the cathode of the diode 82 is opposite in phase to the potential of the cathode of the diode 81 .

FIG. 4A is a waveform diagram of the single-phase alternating current supplied from the single-phase alternating current power supply 20. FIG. FIG. 4B is a waveform diagram of the detection signal line 102 when the third terminal 13 is open.

As shown in FIG. 4B, when the third terminal 13 is in an open state, the potential of the detection signal line 102 is a signal that remains high level and does not change. This is because the third terminal 13 is open. Since one terminal of the resistance element 88 and the other terminal of the resistance element 88 both have the ground potential, the one terminal of the resistance element 88 and the other terminal of the resistance element 88 have the same potential, and the transistor 84 is turned off. This is because the state does not change.

The detection circuit 80 outputs the first detection signal, the second detection signal, and the third detection signal from the two detection signal lines, ie, the detection signal line 101 and the detection signal line 102, with the above configuration. Here, specifically, the first detection signal alternates between a high level and a low level in the same cycle as the cycle of the single-phase alternating current, in which the detection signal line 101 and the detection signal line 102 are in phase with each other. It is a pulse signal that repeats every Specifically, the second detection signal is a pulse in which the detection signal line 101 and the detection signal line 102 are in phases opposite to each other, and alternately repeat high level and low level in the same period as the period of the single-phase alternating current. is a signal. Specifically, the detection signal line 101 of the third detection signal is a pulse signal that alternately repeats a high level and a low level in the same period as the single-phase alternating current, and the detection signal line 102 is a high level pulse signal. It is a signal that does not change.

Returning to FIG. 1 again, the description of the motor 10 is continued.

Control unit 70 outputs a PWM signal to inverter 40 . More specifically, when the detection circuit 80 outputs the first detection signal, the controller 70 puts the rotor 60 in the first rotation state, and the detection circuit 80 outputs the second detection signal. When the detection circuit 80 outputs the third detection signal, the PWM signal is set so that the rotor 60 is in the third rotation state. to output

Here, the first rotation state, the second rotation state, and the third rotation state may be any rotation state of the rotor 60 as long as the rotation state of the rotor 60 is different. good. For example, a first rotational state is a state in which the rotor 60 rotates in a first rotational direction at a first rotational speed, and a second rotational state is a state in which the rotor 60 rotates in the first rotational direction at a first rotational speed. The third rotation state is a state in which the rotor 60 rotates in a second rotation direction that is opposite to the first rotation direction. good too. Further, for example, the first rotation state is a state in which the rotor 60 rotates in the first rotation direction at a first rotation speed, and the second rotation state is a state in which the rotor 60 rotates in the first rotation direction. A state in which the rotor 60 rotates at a second rotational speed that is higher than the first rotational speed, and a third rotational state is a state in which the rotor 60 rotates in the first rotational direction at a third rotational speed that is higher than the second rotational speed. It may be in a state of rotating at The control unit 70 may be implemented by, for example, a microcomputer (not shown) built into the motor 10 executing a program stored in a memory (not shown) built into the motor 10 .

The storage unit 71 stores PWM information that defines the waveform of the PWM signal output by the control unit 70 . That is, the control unit 70 outputs a PWM signal based on the PWM information stored in the storage unit 71. FIG. The storage unit 71 may be implemented by, for example, a memory (not shown) built into the motor 10 .

The operation reception unit 73 receives an operation from a user who uses the motor drive system 1 . The operation accepted by operation accepting portion 73 includes an operation for updating the PWM signal. The operation reception unit 73 may be implemented by, for example, a touch panel, keyboard, switch, or the like. Further, the operation reception unit 73 includes, for example, an interface circuit capable of communicating with an external device (for example, a personal computer). By receiving a signal, it may accept an operation from the user.

Update unit 72 updates the PWM signal stored in storage unit 71 based on the user's operation accepted by operation accepting unit 73 . The update unit 72 may be implemented by, for example, a microcomputer (not shown) built into the motor 10 executing a program stored in a memory (not shown) built into the motor 10 .

As described above, the motor 10 of the present embodiment includes the first terminal 11 and the second terminal 12 to which the single-phase alternating current is input, the third terminal 13, the first terminal 11 and the second terminal. AC/DC converter 30 connected to terminal 12 for converting single-phase alternating current to direct current, and pulse width modulation control (PWM control) by pulse width modulation signal (PWM signal), direct current to three-phase alternating current An inverter 40 for conversion, a winding 50 supplied with a three-phase alternating current, a rotor 60 rotating by a magnetic field generated in the winding 50, a control section 70 for outputting a PWM signal to the inverter, and connected to a third terminal. The detection circuit 80 is configured such that, when a single-phase alternating current is input to the first terminal 11 and the second terminal 12, (1) the third terminal 13 is connected to the first (2) output a second detection signal when the third terminal 13 is short-circuited with the second terminal 12; ) Outputs a third detection signal when the third terminal 13 is in an open state, and the control unit 70 detects that the rotor 60 is in the first state when the detection circuit 80 outputs the first detection signal. When the detection circuit 80 outputs the second detection signal, the rotor 60 is in the second rotation state, and when the detection circuit 80 outputs the third detection signal, the rotor 60 is rotated. A PWM signal is output so that is in the third rotation state.

This provides a motor capable of dynamically switching between three operating modes with different rotational states, and having one terminal in addition to a pair of terminals for power supply.

Further, the motor 10 further includes a storage unit 71 that stores PWM information that defines the waveform of the PWM signal, an update unit 72 that updates the PWM information, an operation reception unit 73 that receives an operation from the user of the motor 10, , the control unit 70 may output a PWM signal based on the PWM information, and the updating unit 72 may update the PWM information based on the operation received by the operation receiving unit 73 from the user.

<Discussion>
According to the motor 10 configured as described above, (1) the third terminal 13 is short-circuited with the first terminal 11, so that the rotor 60 is brought into the first rotation state, and (2) the third By short-circuiting the terminal 13 and the second terminal 12, the rotor 60 is in the second rotating state. (3) By opening the third terminal 13, the rotor 60 is A third rotation state is entered. As described above, the motor 10 is a motor capable of dynamically switching between three operation modes with different rotation states, and is provided with a pair of power supply terminals (that is, the first terminal 11 and the second terminal 11). A motor is provided with one terminal (ie, a third terminal 13) in addition to the terminal 12).

The first rotation state, the second rotation state, and the third rotation state include at least a rotation state in which the rotor 60 rotates in the first rotation direction and a rotation state in which the rotor 60 rotates in the first rotation direction. By including the rotation state in the second rotation direction opposite to , the motor 10 can operate in an operation mode in which the rotation directions of the rotor 60 are opposite to each other.

The motor 10 can operate in an operation mode set by a user who uses the motor drive system 1 by operating the operation reception unit 73 .

(Embodiment 2)
A motor drive system according to a second embodiment, which is configured by partially changing the motor drive system 1 according to the first embodiment, will be described below.

In the following, regarding the motor drive system according to the second embodiment, the same components as those of the motor drive system 1 according to the first embodiment have already been described, and are given the same reference numerals, and detailed description thereof will be given. are omitted, and differences from the motor drive system 1 will be mainly described.

FIG. 5 is a block diagram showing a configuration example of a motor drive system 1A according to the second embodiment.

As shown in FIG. 5, the motor drive system 1A is configured by changing the motor 10 according to the first embodiment to a motor 10A in the motor drive system 1 according to the first embodiment.

As shown in FIG. 5, the motor 10A is configured by changing the detection circuit 80 according to the first embodiment to a detection circuit 80A in the motor 10 according to the first embodiment. The following description focuses on the detection circuit 80A.

As shown in FIG. 5, the detection circuit 80A differs from the detection circuit 80 according to the first embodiment in that the resistance element 89 according to the first embodiment is changed to a resistance element 89A and a resistance element 89B. The detection signal line 101 according to the first embodiment is changed to a detection signal line 101A. A diode 92 , a diode 93 , and a detection signal line 103 are additionally configured.

The resistance elements 89A and 89B are connected in series between the control power supply 91 and the ground to divide the control potential. Here, as an example, the resistance value of the resistance element 89A and the resistance value of the resistance element 89B are equal. Therefore, the voltage-divided potential (hereinafter also referred to as “divided voltage potential”) is 2.5V.

A connection point between the resistance element 89A and the resistance element 89B is also connected to the detection signal line 101A. Therefore, the resistive element 89A and the resistive element 89B convert the detection signal line 101A into a divided potential.

Therefore, the potential of the detection signal line 101A becomes middle level (that is, divided voltage potential) when the divided voltage potential of the pulsating current rectified by the diode 81 is smaller than the threshold, and low level (that is, divided voltage potential) when larger than the threshold. That is, it becomes approximately ground potential).

FIG. 6A is a waveform diagram of the single-phase alternating current supplied from the single-phase alternating current power supply 20. FIG. FIG. 6B is a waveform diagram of the detection signal line 101A.

As shown in FIG. 6B, the potential of the detection signal line 101A becomes a pulse signal that alternately repeats a middle level and a low level with the same period as the single-phase alternating current.

The diode 92 has an anode connected to the detection signal line 101 A and a cathode connected to the detection signal line 103 . The diode 93 has an anode connected to the detection signal line 102 and a cathode connected to the detection signal line 103 . That is, the diodes 92 and 93 are connected in parallel so that their anodes are connected to each other.

The diodes 92 and 93 connected in parallel in this manner function as a wired OR circuit that receives the detection signal lines 101A and 102 as inputs and outputs the detection signal line 103 . That is, the diodes 92 and 93 output to the detection signal line 103 a potential that is not smaller than the potential of the detection signal line 101A and the potential of the detection signal line 102 .

As described above in Embodiment 1, the potential of the detection signal line 102 when the third terminal 13 is short-circuited to the first terminal 11 is the period of the single-phase alternating current shown in FIG. 2B. becomes a pulse signal that alternately repeats a high level and a low level in the same cycle as . Therefore, the potential of the detection signal line 103 in the state where the third terminal 13 is short-circuited to the first terminal 11 changes between the middle level and the low level in the same period as the single-phase alternating current shown in FIG. 6B. and the pulse signal shown in FIG. 2B that alternately repeats a high level and a low level in the same period as the single-phase alternating current, the potential is not small. Therefore, the potential of the detection signal line 103 when the third terminal 13 is short-circuited to the first terminal 11 is high level and low level in the same period as the single-phase alternating current shown in FIG. 2B. It becomes a pulse signal that alternately repeats the level. Therefore, FIG. 2B is also a waveform diagram of the detection signal line 102 in a state where the third terminal 13 is short-circuited to the first terminal 11 in the second embodiment.

As described above in Embodiment 1, the potential of detection signal line 102 in the state where third terminal 13 is shorted to second terminal 12 is opposite to the potential of detection signal line 101A shown in FIG. 3B. It becomes a pulse signal that alternately repeats a high level and a low level in the same period as the period of the single-phase alternating current. Therefore, the potential of the detection signal line 103 in the state where the third terminal 13 is short-circuited to the second terminal 12 changes between the middle level and the low level in the same period as the single-phase alternating current shown in FIG. 6B. and a pulse signal that alternately repeats a high level and a low level in the same cycle as the cycle of the single-phase alternating current, which is in phase opposite to the potential of the detection signal line 101A shown in FIG. 3B, The potential is not small. Therefore, the potential of the detection signal line 103 in the state where the third terminal 13 is short-circuited to the first terminal 11 is at a high level in the same cycle as the cycle of the single-phase alternating current, which is opposite in phase to the potential of the detection signal line 101A. and middle level alternately.

FIG. 7A is a waveform diagram of the single-phase alternating current supplied from the single-phase alternating current power supply 20. FIG. FIG. 7B is a waveform diagram of the detection signal line 103 when the third terminal 13 is short-circuited to the second terminal 12. FIG.

As described above in the first embodiment, the potential of the detection signal line 102 when the third terminal 13 is in the open state becomes a signal that remains high level and does not change, as shown in FIG. 4B. Therefore, the potential of the detection signal line 103 when the third terminal 13 is in the open state is the pulse signal shown in FIG. 4B, the potential is not smaller than the signal that remains high level and does not change. Therefore, the potential of the detection signal line 103 when the third terminal 13 is in the open state becomes a signal that remains high level and does not change, as shown in FIG. 4B. Therefore, FIG. 4B is also a waveform diagram of the detection signal line 103 when the third terminal 13 is open in the second embodiment.

The detection circuit 80A outputs the first detection signal, the second detection signal, and the third detection signal from one detection signal line 103 with the above configuration. Here, the first detection signal is specifically a pulse signal that alternately repeats a high level and a low level in the same period as the period of the single-phase alternating current. Specifically, the second detection signal is a pulse signal that is opposite in phase to the first detection signal and alternately repeats a high level and a middle level in the same period as the single-phase alternating current. Further, the third detection signal is specifically a signal that the detection signal line 103 remains at a high level and does not change.

<Discussion>
According to the motor 10A having the above configuration, similarly to the motor 10 according to the first embodiment, the motor is capable of dynamically switching between three operation modes with different rotation states, and is provided with a pair of terminals for power supply. A motor is provided having one terminal in addition to the .

Motor 10A, like motor 10 according to the first embodiment, can operate in an operation mode in which the rotation directions of rotor 60 are opposite to each other.

Motor 10A, like motor 10 according to the first embodiment, can operate in an operation mode set by an operation to operation reception unit 73 by a user who uses motor drive system 1A.

(Embodiment 3)
A motor drive system according to a third embodiment, which is configured by partially changing the motor drive system 1 according to the first embodiment, will be described below.

In the following, regarding the motor drive system according to the third embodiment, the same components as those of the motor drive system 1 according to the first embodiment have already been described, and are assigned the same reference numerals for detailed description. are omitted, and differences from the motor drive system 1 will be mainly described.

FIG. 8 is a block diagram showing a configuration example of a motor drive system 1B according to the third embodiment.

As shown in FIG. 8, the motor drive system 1B is configured by changing the motor 10 according to the first embodiment to a motor 10B in the motor drive system 1 according to the first embodiment.

As shown in FIG. 8, the motor 10B is configured by changing the detection circuit 80 according to the first embodiment to a detection circuit 80B in the motor 10 according to the first embodiment. The detection circuit 80B will be mainly described below.

As shown in FIG. 8, the detection circuit 80B includes a control power supply 91, a diode 111, a diode 112, a diode 113, a diode 114, a resistance element 115, a resistance element 116, a resistance element 117, and a detection signal line 120. .

The diode 111 has an anode connected to the first terminal 11 and rectifies the single-phase AC input from the single-phase AC power supply 20 to the first terminal 11 .

Diode 112 is a device similar to diode 111 . The diode 112 has an anode connected to the third terminal 13, and (1) when the third terminal 13 is short-circuited to the first terminal 11, the input from the single-phase AC power supply 20 to the first terminal 11; (2) when the third terminal 13 is short-circuited to the second terminal 12, the single-phase alternating current input from the single-phase AC power supply 20 to the second terminal 12 is rectified; rectify.

The resistance element 115 has one terminal connected to the cathode of the diode 111 and the other terminal connected to the detection signal line 120 .

Resistance element 116 is an element similar to resistance element 115 . The resistance element 116 has one terminal connected to the cathode of the diode 112 and the other terminal connected to the detection signal line 120 . That is, the resistive element 115 and the resistive element 116 are connected in parallel so that the other terminals are connected to each other.

The resistance element 117 has one terminal connected to the detection signal line 120 and the other terminal connected to the ground. That is, resistor elements 115 and 117 are connected in series between the cathode of diode 111 and ground. Therefore, the resistance element 115 and the resistance element 117 divide the potential of the cathode of the diode 111 . Resistive elements 116 and 117 are connected in series between the cathode of diode 112 and the ground. Therefore, resistor element 116 and resistor element 117 divide the potential of the cathode of diode 112 . Therefore, the potential of the detection signal line 120 is (1) the potential of the cathode of the diode 111 divided by the resistance elements 115 and 117, and (2) the potential divided by the resistance elements 116 and 117. In addition, the potential of the cathode of the diode 112 is superimposed thereon.

FIG. 9A is a waveform diagram of the single-phase alternating current supplied from the single-phase alternating current power supply 20. FIG. FIG. 9B is a waveform diagram of the detection signal line 120 when the third terminal 13 is open.

When the third terminal 13 is open, the potential of the detection signal line 120 is the potential of the cathode of the diode 111 divided by the resistance elements 115 and 117 .

Therefore, when the third terminal 13 is open, as shown in FIG. It becomes a voltage-divided potential. That is, the signal of the detection signal line 120 when the third terminal 13 is open becomes a pulsating current that pulsates with the same period as the single-phase alternating current.

FIG. 10A is a waveform diagram of single-phase alternating current supplied from single-phase alternating current power supply 20. FIG. 10B is a waveform diagram of the detection signal line 120 when the third terminal 13 is short-circuited to the first terminal 11. FIG.

When the third terminal 13 is short-circuited to the first terminal 11, both the diodes 111 and 112 rectify the single-phase AC input from the single-phase AC power supply 20 to the first terminal 11. . Therefore, the pulsating current half-wave rectified by the diode 111 and the pulsating current half-wave rectified by the diode 112 have the same phase.

Therefore, when the third terminal 13 is short-circuited to the first terminal 11, the potential of the detection signal line 120 is (1) half-wave rectified by the diode 111 as shown in FIGS. 10A and 10B. (2) the potential of the pulsating current half-wave rectified by the diode 112 is divided by the resistor element 116 and the resistor element 117; is superimposed in the same phase as the applied potential. That is, the signal of the detection signal line 120 when the third terminal 13 is connected to the first terminal 11 becomes a pulsating current that pulsates with the same cycle as single-phase alternating current.

As shown in FIGS. 9A, 9B, 10A, and 10B, the peak potential of the detection signal line 120 when the third terminal 13 is short-circuited to the first terminal 11 (hereinafter also referred to as "high peak potential") is higher than the peak potential of the detection signal line 120 when the third terminal 13 is open (hereinafter also referred to as "middle peak potential").

When the third terminal 13 is short-circuited to the second terminal 12 , the diode 111 rectifies the single-phase AC input from the single-phase AC power supply 20 to the first terminal 11 . Diode 112 rectifies the single-phase AC input from single-phase AC power supply 20 to second terminal 12 . Therefore, the pulsating current half-wave rectified by the diode 111 and the pulsating current half-wave rectified by the diode 112 have opposite phases to each other.

Therefore, when the third terminal 13 is short-circuited to the second terminal 12, the potential of the detection signal line 120 is (1) half-wave rectified by the diode 111 as shown in FIGS. 11A and 11B. (2) the potential of the pulsating current half-wave rectified by the diode 112 is divided by the resistive element 116 and the resistive element 117; It becomes a potential in which the applied potential and the applied potential are superimposed in opposite phases to each other. 11A is a waveform diagram of single-phase alternating current supplied from single-phase alternating current power supply 20. FIG. 11B is a waveform diagram of the detection signal line 120. FIG. That is, the signal of the detection signal line 120 in the state where the third terminal 13 is connected to the second terminal 12 becomes a pulsating current that pulsates at twice the period of the single-phase alternating current.

The detection circuit 80B outputs the first detection signal, the second detection signal, and the third detection signal from one detection signal line 120 with the above configuration. Here, specifically, the first detection signal is a pulsating current signal that pulsates in the same period as the period of the single-phase alternating current and has a high peak potential. Further, the second detection signal is specifically a pulsating current signal that pulsates with a period twice as long as the period of the single-phase alternating current. Further, the third detection signal is, specifically, a pulsating current signal that pulsates in the same period as the period of the single-phase alternating current and has a peak potential that is a middle peak potential.

<Discussion>
According to the motor 10B having the above configuration, similarly to the motor 10 according to the first embodiment, the motor 10B is a motor capable of dynamically switching between three operation modes with different rotation states, and has a pair of terminals for power supply. A motor is provided having one terminal in addition to the .

Motor 10B, like motor 10 according to the first embodiment, can operate in an operation mode in which the rotation directions of rotor 60 are opposite to each other.

Motor 10B, like motor 10 according to the first embodiment, can operate in an operation mode set by an operation to operation reception unit 73 by a user who uses motor drive system 1B.

(Other embodiments)
Although the motor drive device according to one aspect of the present disclosure has been described above based on Embodiment 1, Embodiment 2, and Embodiment 3, the present disclosure is not limited to these embodiments. . As long as it does not deviate from the spirit of the present disclosure, one or more of the present disclosure may include various modifications that can be made by those skilled in the art, or a configuration constructed by combining the components of different embodiments. included within the scope of the aspect of

The present disclosure is widely applicable to motors.

Reference Signs List 1, 1A, 1B Motor drive system 10, 10A, 10B Motor 20 Single-phase AC power supply 11 First terminal 12 Second terminal 13 Third terminal 30 AC/DC converter 40 Inverter 50 Winding 60 Rotor 70 Control unit 71 storage unit 72 update unit 73 operation reception unit 80, 80A, 80B detection circuit 81, 82, 92, 93, 111, 112, 113, 114 diode 83, 84 NPN transistor (transistor)
85, 86, 87, 88, 89, 89A, 89B, 90, 115, 116, 117 resistance element 91 control power source 101, 101A, 102, 103, 120 detection signal line

Claims (4)

a first terminal and a second terminal to which a single-phase alternating current is input;
a third terminal;
an AC/DC converter connected to the first terminal and the second terminal and configured to convert the single-phase alternating current to direct current;
an inverter that converts the direct current into a three-phase alternating current by being pulse width modulated controlled by a pulse width modulated signal;
a winding to which the three-phase alternating current is supplied;
a rotor rotated by the magnetic field generated in the winding;
a control unit that outputs the pulse width modulated signal to the inverter;
a detection circuit connected to the third terminal;
When the single-phase alternating current is input to the first terminal and the second terminal, the detection circuit detects that (1) the third terminal is short-circuited with the first terminal. (2) outputting a second detection signal when the third terminal is short-circuited with the second terminal; (3) the third terminal is in an open state; Output a third detection signal when
The control section controls the rotor to be in the first rotation state when the detection circuit outputs the first detection signal, and the rotor to the first rotation state when the detection circuit outputs the second detection signal. outputting the pulse width modulated signal so that the rotor is in the third rotation state when the rotor is in the second rotation state and the detection circuit is outputting the third detection signal; motor. The first rotation state, the second rotation state, and the third rotation state include at least a rotation state in which the rotor rotates in the first rotation direction, and a rotation state in which the rotor rotates in the first rotation direction. 2. A motor according to claim 1, comprising a rotational state of rotating in one direction of rotation and a second, opposite direction of rotation. The first rotation state is a state in which the rotor rotates in a first rotation direction at a first rotation speed,
The second rotation state is a state in which the rotor rotates in the first rotation direction at a second rotation speed faster than the first rotation speed,
2. The motor according to claim 1, wherein said third rotating state is a state in which said rotor rotates in a second rotating direction opposite to said first rotating direction. a storage unit that stores pulse width modulation information that defines the waveform of the pulse width modulation signal;
an updating unit that updates the pulse width modulation information;
an operation reception unit that receives an operation of the motor from a user,
The control unit outputs the pulse width modulated signal based on the pulse width modulation information, and the updating unit outputs the pulse width modulation information based on the user's operation accepted by the operation accepting unit. 3. The motor according to claim 1 or claim 2, wherein the update is performed.

Images